Frequencies for first 10,000 rows of prescr2 variable in nhamcsopd2010 dataset :

               prescription status code |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                      prescription drug |      3,846       38.46       38.46
                   nonprescription drug |        230        2.30       40.76
                           undetermined |        139        1.39       42.15
both prescription and otc (over the cou |        982        9.82       51.97
                                      . |      4,803       48.03      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016